1995 Ford Diesel High Idle Wiring Diagram - DPDT Relay & TPS/IVS Mod Schematic

This is a hand-drawn wiring diagram documenting a DIY high-idle circuit installed on a white 1995 diesel truck. The circuit uses two RadioShack components: a 275-248 SPDT switch/relay used as a brake interlock and a 275-218 DPDT relay used as the idle control relay. Switched +12V (labeled Red, 'High Idle on/off') feeds through the brake interlock, which is controlled by the brake light switch (+12V when the pedal is pressed, purple wire), so the high idle disengages when braking. The DPDT relay pins are numbered 1–8: pin 7 receives the switched power, pin 8 goes to ground (black), pin 3 splices into the brown wire on the IVS (idle validation switch), pin 5 connects to red/orange from the harness to the IVS, pin 1 to red/orange on the IVS, pin 6 to brown/white from the harness to the TPS, pin 2 to brown/white on the TPS splice, and pin 4 routes through a 1k ohm resistor to an idle speed control potentiometer whose wiper ties to grey/white on the TPS. Boxed labels indicate the builder's own wire colors (Red, Purple, Blk, Blue, Green #1, Green #2, BRN/WHT, Yellow #1). Useful for anyone replicating a manual high-idle mod on a mid-90s Ford diesel.